141 lines
8.7 KiB
HTML
141 lines
8.7 KiB
HTML
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<meta name="DC.Title" content="SQLExecute - Execute a statement" />
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<link rel="stylesheet" type="text/css" href="./ic.css" />
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<title>SQLExecute</title>
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</head>
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<body id="rzadpfnexec"><a name="rzadpfnexec"><!-- --></a>
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<!-- Java sync-link --><script language="Javascript" src="../rzahg/synch.js" type="text/javascript"></script>
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<h1 class="topictitle1">SQLExecute - Execute a statement</h1>
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<div><div class="section"></div>
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<div class="section"><h4 class="sectiontitle">Purpose</h4> <p><samp class="codeph">SQLExecute()</samp> executes
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a statement, that is successfully prepared using <samp class="codeph">SQLPrepare()</samp>,
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once or multiple times. The statement is processed using the current values
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of any application variables that were bound to parameter markers by <samp class="codeph">SQLBindParam()</samp>.</p>
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</div>
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<div class="section"><h4 class="sectiontitle">Syntax</h4><pre>SQLRETURN SQLExecute (SQLHSTMT hstmt);</pre>
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</div>
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<div class="section"><h4 class="sectiontitle">Function arguments</h4>
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<div class="tablenoborder"><table cellpadding="4" cellspacing="0" summary="" width="100%" frame="hsides" border="1" rules="all"><caption>Table 1. SQLExecute arguments</caption><thead align="left"><tr><th align="left" valign="bottom" width="20%" id="d0e54">Data type</th>
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<th align="left" valign="bottom" width="20%" id="d0e56">Argument</th>
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<th align="left" valign="bottom" width="20%" id="d0e58">Use</th>
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<th align="left" valign="bottom" width="40%" id="d0e60">Description</th>
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</tr>
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</thead>
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<tbody><tr><td align="left" valign="top" width="20%" headers="d0e54 ">SQLHSTMT</td>
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<td align="left" valign="top" width="20%" headers="d0e56 "><em>hstmt</em></td>
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<td align="left" valign="top" width="20%" headers="d0e58 ">Input</td>
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<td align="left" valign="top" width="40%" headers="d0e60 ">Statement handle. There must not be an open
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cursor associated with hstmt, see <a href="rzadpfnfstmt.htm#rzadpfnfstmt">SQLFreeStmt - Free (or reset) a statement handle</a>
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for more information.</td>
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</tr>
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</tbody>
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</table>
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</div>
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</div>
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<div class="section"><h4 class="sectiontitle">Usage</h4><p>The SQL statement string might contain parameter
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markers. A parameter marker is represented by a "?" character, and indicates
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a position in the statement where the value of an application variable is
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to be substituted, when <samp class="codeph">SQLExecute()</samp> is called. <samp class="codeph">SQLBindParam()</samp> is
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used to bind (or associate) an application variable to each parameter marker,
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and to indicate if any data conversion should be performed at the time the
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data is transferred. All parameters must be bound before calling <samp class="codeph">SQLExecute()</samp>.</p>
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<p>As
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soon as the application has processed the results from the <samp class="codeph">SQLExecute()</samp> call,
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it can process the statement again with new (or the same) values in the application
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variables.</p>
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<p>A statement processed by <samp class="codeph">SQLExecDirect()</samp> cannot
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be reprocessed by calling <samp class="codeph">SQLExecute()</samp>; <samp class="codeph">SQLPrepare()</samp> must
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be called first.</p>
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<p>If the prepared SQL statement is a SELECT, <samp class="codeph">SQLExecute()</samp> generates
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a cursor name, and opens the cursor. If the application has used <samp class="codeph">SQLSetCursorName()</samp> to
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associate a cursor name with the statement handle, DB2<sup>®</sup> UDB CLI associates the application generated
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cursor name with the internally generated cursor name.</p>
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<p>To process a
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SELECT statement more than once, the application must close the cursor by
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calling call <samp class="codeph">SQLFreeStmt()</samp> with the SQL_CLOSE option. There
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must not be an open cursor on the statement handle when calling <samp class="codeph">SQLExecute()</samp>.</p>
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<p>To
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retrieve a row from the result set generated by a SELECT statement, call <samp class="codeph">SQLFetch()</samp> after <samp class="codeph">SQLExecute()</samp> returns
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successfully.</p>
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<p>If the SQL statement is a positioned DELETE or a positioned
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UPDATE, the cursor referenced by the statement must be positioned on a row
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at the time <samp class="codeph">SQLExecute()</samp> is called, and must be defined on
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a separate statement handle under the same connection handle.</p>
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</div>
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<div class="section"><h4 class="sectiontitle">Return codes</h4><ul><li>SQL_SUCCESS</li>
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<li>SQL_SUCCESS_WITH_INFO</li>
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<li>SQL_ERROR</li>
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<li>SQL_INVALID_HANDLE</li>
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<li>SQL_NO_DATA_FOUND</li>
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</ul>
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<p>SQL_NO_DATA_FOUND is returned if the SQL statement is a Searched UPDATE
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or Searched DELETE and no rows satisfy the search condition.</p>
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</div>
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<div class="section"><h4 class="sectiontitle">Diagnostics</h4><div class="p">The SQLSTATEs for <samp class="codeph">SQLExecute()</samp> include
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all those for <samp class="codeph">SQLExecDirect()</samp> (see <a href="rzadpfnexecd.htm#rzadpfnexecd__tbexecd">Table 2</a>)
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except for <strong>HY</strong>009, and with the addition of the SQLSTATEs in the following
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table.
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<div class="tablenoborder"><table cellpadding="4" cellspacing="0" summary="" width="100%" frame="hsides" border="1" rules="rows"><caption>Table 2. SQLExecute
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SQLSTATEs</caption><thead align="left"><tr><th align="left" valign="top" width="25%" id="d0e183">SQLSTATE</th>
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<th align="left" valign="top" width="25%" id="d0e185">Description</th>
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<th align="left" valign="top" width="50%" id="d0e187">Explanation</th>
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</tr>
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</thead>
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<tbody><tr><td align="left" valign="top" width="25%" headers="d0e183 "><strong>HY</strong>010</td>
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<td align="left" valign="top" width="25%" headers="d0e185 ">Function sequence error</td>
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<td align="left" valign="top" width="50%" headers="d0e187 ">The specified <em>hstmt</em> is not in prepared
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state. <samp class="codeph">SQLExecute()</samp> is called without first calling <samp class="codeph">SQLPrepare</samp>.</td>
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</tr>
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<tr><td valign="top" width="25%" headers="d0e183 "><strong>HY</strong>021</td>
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<td valign="top" width="25%" headers="d0e185 ">Internal descriptor that is not valid </td>
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<td valign="top" width="50%" headers="d0e187 ">The internal descriptor cannot be addressed or allocated,
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or it contains a value that is not valid.</td>
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</tr>
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<tr><td colspan="3" align="left" valign="top" headers="d0e183 d0e185 d0e187 "> <div class="note"><span class="notetitle">Note:</span> There
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are many other SQLSTATE values that can be generated by the Database Management
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System (DBMS), on processing of the statement.</div>
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</td>
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</tr>
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</tbody>
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</table>
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</div>
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</div>
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</div>
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<div class="section"><h4 class="sectiontitle">Example</h4></div>
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<div class="example" id="rzadpfnexec__xmexec"><a name="rzadpfnexec__xmexec"><!-- --></a><p>Refer to the <samp class="codeph">SQLPrepare()</samp> <a href="rzadpfnprep.htm#rzadpfnprep__xmprep">rzadpfnprep.htm#rzadpfnprep__xmprep</a></p>
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</div>
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<div class="section"><h4 class="sectiontitle">References</h4><ul><li><a href="rzadpfnexecd.htm#rzadpfnexecd">SQLExecDirect - Execute a statement directly</a></li>
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<li><a href="rzadpfnbindc.htm#rzadpfnbindc">SQLBindCol - Bind a column to an application variable</a></li>
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<li><a href="rzadpfnprep.htm#rzadpfnprep">SQLPrepare - Prepare a statement</a></li>
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<li><a href="rzadpfnfetch.htm#rzadpfnfetch">SQLFetch - Fetch next row</a></li>
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<li><a href="rzadpfnspara.htm#rzadpfnspara">SQLSetParam - Set parameter</a></li>
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</ul>
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</div>
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</div>
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<div>
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<div class="familylinks">
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<div class="parentlink"><strong>Parent topic:</strong> <a href="rzadphdapi.htm" title="This topic provides a description of each CLI function.">DB2 UDB CLI functions</a></div>
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</div>
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</div>
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</body>
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</html>
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